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How long does it take to bleed cooling system?

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Old 01-11-2019, 02:35 PM
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How long does it take to bleed cooling system?

How long does it take to bleed cooling system? Do i still have air in the system? or do i have another problem?
I spent all day trying to bleed my car yesterday, and it is still overheating after like 15 min of idle with no heat.
I flushed the coolant because i heard swooshing in dash and also after driving it hard it overheated. I popped hood and saw that my reservoir tank was conpletely full so i assumed it was not completely bled and the air was pushed to the reservoir.
 
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Old 01-11-2019, 02:53 PM
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When this happened to me I had a pinhole leak in one of my heater core lines. I'd recommend pressure testing with a really good gauge and seeing if it holds pressure. Overheating in winter is silly.
 
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Old 01-11-2019, 03:38 PM
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If there's no heat at idle it's not bled properly.

It took me hours and hours to do it the first time without a Lilse funnel, and directly afterwards I "overheated" on the highway after my coolant temp sensor decided it didn't like getting soaked in coolant repeatedly from the heater core bleed valve.
 
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Old 01-11-2019, 04:30 PM
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Originally Posted by cswlightning View Post
If there's no heat at idle it's not bled properly.

It took me hours and hours to do it the first time without a Lilse funnel, and directly afterwards I "overheated" on the highway after my coolant temp sensor decided it didn't like getting soaked in coolant repeatedly from the heater core bleed valve.
How exactly did you bleed yours? Are you just using the bleeder valve? I am opening both the radiator cap and bleeder valve, pouring coolant through the radiator until i see it come out of the bleeder valve, close them both, start the car, idle, rev to 3,000 rpm, shut car off, cool down
 
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Old 01-11-2019, 04:32 PM
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You need to use a spill free funnel.
 
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Old 01-11-2019, 04:36 PM
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Originally Posted by Urbanengineer View Post
You need to use a spill free funnel.
Okay, ill buy that and search how to use it
 
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Old 01-11-2019, 05:36 PM
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I haven't had any issues on 3 different G35 and one 350Z in the last year. Open the bleed valve, add coolant VERY SLOWLY it takes well over a minute for me to add 1 gallon and close the valve when it spills out then fill radiator till full, start the engine with the heater on high and max fanspeed, wwhen it's almost completely hot rev it to about 5k rpm and hold it for about 10 seconds then go for a very short drive around the block but run it hard. Return to the shop, let it cool with a blower fan on it to speed up the process, open the radiator and top it off, top off the reservoir and then go for a normal drive.

If you add coolant quickly you're guaranteed to trap air in it.
 
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Old 01-11-2019, 05:42 PM
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^^^ I tried doing that and messed it up by pouring the coolant too quickly I'm pretty sure. The funnel is just so much easier.
 
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Old 01-11-2019, 09:23 PM
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About 10 minutes with the lisle funnel
 
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Old 01-12-2019, 09:18 AM
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It also helps with the bleeding process to have the front end of the car jacked up. That encourages any air to move up to the highest point in the system which is the radiator cap area. Also squeezing both radiator hoses can help move things, just make sure your thermostat is working properly.
 
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Old 01-12-2019, 11:39 AM
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Originally Posted by FreshLikeAG View Post
About 10 minutes with the lisle funnel
How did you do it w/ the funnel then? Bc my car is still overheating after a while with the funnel
 
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Old 01-12-2019, 11:40 AM
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Originally Posted by Blue Dream View Post
It also helps with the bleeding process to have the front end of the car jacked up. That encourages any air to move up to the highest point in the system which is the radiator cap area. Also squeezing both radiator hoses can help move things, just make sure your thermostat is working properly.
Car is jacked up, tried funnel, still overheating no heat at idle
 
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Old 01-12-2019, 07:17 PM
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This how I bleed my car and I've done it several times.

install funnel
pour coolant
fill reservoir full
leave funnel full
start car heat on full
squeeze both hoses
rev car to about 2000 rpm several times
i go off how the radiator hoses feel before proceeding. I've even used an IR gun.
once bith hoses are close in temp, I usually still have cold air in cabin.
Take it out for a fast test drive and get instant hot air.
takes about 45 mins min and I've done it for as much as an hour or more before the final test drive.

I also have an airlift system, but haven't had a chance to try it. Puts a vacuum on the system and then uses venturi affect to refill it.

i don't use the bleeder valve, since it broke once when I was working and sprayed me with coolant.
 
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